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Manpages Base64Section: User Contributed Perl Documentation (3)Updated: perl v5.6.0 Index Return to Main Contents NAMEMIME::Base64 - Encoding and decoding of base64 stringsSYNOPSISuse MIME::Base64; $encoded = encode_base64('Aladdin:open sesame'); $decoded = decode_base64($encoded); DESCRIPTIONThis module provides functions to encode and decode strings into the Base64 encoding specified in RFC 2045 - MIME (Multipurpose Internet Mail Extensions). The Base64 encoding is designed to represent arbitrary sequences of octets in a form that need not be humanly readable. A 65-character subset ([A-Za-z0-9+/=]) of US-ASCII is used, enabling 6 bits to be represented per printable character.
The following functions are provided:
If you prefer not to import these routines into your namespace you can call them as:
use MIME::Base64 (); $encoded = MIME::Base64::encode($decoded); $decoded = MIME::Base64::decode($encoded); DIAGNOSTICSThe following warnings might be generated if perl is invoked with the `-w' switch:
EXAMPLESIf you want to encode a large file, you should encode it in chunks that are a multiple of 57 bytes. This ensures that the base64 lines line up and that you do not end up with padding in the middle. 57 bytes of data fills one complete base64 line (76 == 57*4/3):
use MIME::Base64 qw(encode_base64); open(FILE, "/var/log/wtmp") or die "$!"; while (read(FILE, $buf, 60*57)) { print encode_base64($buf); }or if you know you have enough memory
use MIME::Base64 qw(encode_base64); local($/) = undef; # slurp print encode_base64(<STDIN>);The same approach as a command line:
perl -MMIME::Base64 -0777 -ne 'print encode_base64($_)' <fileDecoding does not need slurp mode if all the lines contains a multiple of 4 base64 chars:
perl -MMIME::Base64 -ne 'print decode_base64($_)' <file COPYRIGHTCopyright 1995-1999, 2001 Gisle Aas.This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself. Distantly based on LWP::Base64 written by Martijn Koster <m.koster@nexor.co.uk> and Joerg Reichelt <j.reichelt@nexor.co.uk> and code posted to comp.lang.perl <3pd2lp$6gf@wsinti07.win.tue.nl> by Hans Mulder <hansm@wsinti07.win.tue.nl> The XS implementation use code from metamail. Copyright 1991 Bell Communications Research, Inc. (Bellcore)
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